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The aim of the study was an evaluation of the influence that agonists and antagonists of the cholinergic and adrenergic transmission have on the acquisition and retention of habituation in a pigeon. Habituation training was performed by a rotatory test, under specific drugs influencing cholinergic and adrenergic transmission. The results show that after injection of a cholinergic antagonist or adrenergic agonist the acquisition of habituation is quicker; on the contrary, cholinergic agonists or adrenergic antagonists make this process slower. These drugs do not have any influence on the retention of habituation.

The aim of the study was to determine the role of histaminergic H1, H2 and H3 transmission on the acquisition of vestibular habituation in pigeons. Rotatory training was used and the intraperitoneal injections of the agonists and antagonists of receptors described above were performed before each training. The results showed that agonists of H1 and H2, and H3 antagonist facilitate vestibular habituation. On the other hand, H1 and H2 antagonists restrain this process.

Vestibular habituation-the effect of cholinergic, adrenergic and histaminergic agents on the process. The role of cholinergic, adrenergic and histaminergic transmission on the acquisition of vestibular habituation in pigeons is reported. 1. Cholinolytic, adrenomimetic and histaminergic agents probably clear the way for vestibular habituation in pigeons. 2. The cholinomimetic, adrenolytic and antihistaminergic effects probably inhibit the acquisition of habituation in these animals.

The subject of investigation was the analysis of the acquisition and retention of the vestibular habituation in pigeons after hemispherectomy or hemicerebellectomy. The habituation training was performed using rotatory test. The frequency of head nystagmus and postural reflexes were examined before and after acquisition of habituation and some days later, for evaluation of retention. Our results suggests that hemispherectomy does not inhibit acquisition of habituation but retention of this phenomenon is shorter at that time. The hemicerebellectomy makes impossible the vestibular habituation.

The subject of investigation was the possibility of the transfer of habituation. In 20 pigeons frequency of optokinetic and postrotatoric head nystagmus was established. Then in 10 birds optokinetic habituation training and in 10 remaining pigeons rotatoric habituation training were performed. After acquisition of habituation in the first group, frequency of postrotatoric head nystagmus and in the second group frequency of optokinetic head nystagmus were defined. The transfer of optokinetic habituation to the rotatoric test was confirmed. The inverted process was not observed.

The subject of investigation was the influence of ocular fixation on acquisition of habituation in experimental rotatory test in pigeons. The habituation training was performed in the three difference conditions: with full ocular fixation, fixation partly reduced and fixation excluded. Author confirmed that habituation with fixation excluded gave the best results of habituation of postural reflexes and head nystagmus in pigeons in rotatory training.